[Ducati] 2 into 1 exhaust for 900SS? (Kevin going to dark side

Thu Nov 22 11:31:48 EST 2007

Knowing Guy's work Dave, I agree.  Seeing his heads on Alex's creation 
running amuck with much more larger hp machines at Grattan shows the merit of the 
work.  And as you said going short stacks without head work doesn't garner the 
return on investment.  I'm running 41mm's with high comps (11.5:1) on my '95 SP 
and am quite pleased.  With hind sight I wish I'd been able to spring for the 
944 kit and I still want to lighten the flywheel.  In regards to that, 
someone here stated a loss of rideability doing this in the midrange?  And that 
makes no sense to me.  I know several riders most noteably Arch who have years, 
decades even, of expereince with such mods on their ss/sp machines and report 
wonderful tractability throughout the range. I was waiting ti hear about hte 
dreaded reduction in engine braking myth but maybe that's been quashed.

As to your 2-1, I have an Arrow system with carbon can on my bike.  It is 
known to reduce peak hp by 2-3 but for what I was looking for I'm pleased.  I 
suspect ARC's system properly tuned to an individual bike with head work and such 
could smooth out the curve a bit and eliminate some of that loss, but 
probably not all.  Maybe the loss of weight makes up for the few hp lost?

Anyway, I'm very interested in the ARC setup but have a few questions.  What 
parts of the rear frame did you have to cut off to mount the system?  Any 
extra brackets to hold things in?  I assume they would be part of the system but 
I'm curious.  If you have any pics or hp/torque curves to share please do.

Thanks,
W

In a message dated 11/22/2007 10:24:55 AM Eastern Standard Time, 
acey at mountaincable.net writes:

FWIW I recently enquired to Chris @ ca-cycleworks re: split 41mm FCR's when 
the Canadian dollar hit $1.08 U.S. I just put in new JE 11.5:1 pistons and a 
yoyodyne flywheel in the engine of my '91 900SS trackbike. I also picked up 
a used ArcFab 2-1 underseat tapered header exhaust which I plan to use. 
Similar to this one http://www.arcfabrication.com/images/ssunderseat.JPG

You should talk to Chris directly but he seemed to be saying the same thing 
as Guy and Mark, ie. that the split carbs on short manifolds aren't worth 
the trouble unless the heads are reworked.
http://www.ca-cycleworks.com/shop/heads/heads.html

After looking at Marks's dyno chart I think I would just go with the dual 
FCR kit on the stock manifolds.

On a side note when bumping up compression will I need to re-jet leaner or 
richer? I currently have stock carbs/ K&N airbox top with stage 1 Dynojets 
installed

Dave

> Message: 1
> Date: Wed, 21 Nov 2007 18:12:56 -0500
> From: "Guy at mbpducati.ca" <info at mbpducati.ca>
> Subject: Re: [Ducati] 2 into 1 exhaust for 900SS? (Kevin going to dark
> side)
> To: Ducati Owners Group <ducati at ducati.net>
> Content-Type: text/plain; format=flowed; charset=iso-8859-1;
> reply-type=response
>
> Hi All
> For a start Check this for a +100hp 966 2V Ducati
> http://www.ca-cycleworks.com/shop/heads/dyno.html
> And this combo gain torque & horsepower everywhere NOT just on top
> "Streetability" is NOT compromize on the contrary this thing rock!!!
> Best all around 2V Ducati from getting a quart of milk to the convenience
> store to the track on weekend!
> Hope this help!
> Guy Martin----- Original Message ----- 
> From: "Mark Hatten" <hatman at columbus.rr.com>
> To: "Ducati Owners Group" <ducati at ducati.net>
> Sent: Wednesday, November 21, 2007 4:40 PM
> Subject: Re: [Ducati] 2 into 1 exhaust for 900SS? (Kevin going to dark 
> side)
>
>
>> Kevin, my question would be:  what exactly are you trying to accomplish
>> with your 900SS?  Streetbike?  Trackbike?  Racebike?
>>
>> Some of the information you're getting seems to be, to me at least,
>> somewhat contradictory.  Individual 41s on short manifolds will indeed 
>> net
>> a few more horses, but it's all from 7k to 8k.  The power starts falling
>> off at 7k when the 41s are mounted on stock manifolds.  Prior to 7k, the
>> power curve is virtually identical between the two.  So the individual
>> carbs/short manifolds don't really seem to be in keeping with your quest
>> for mid-range.
>>
>> Check out the dyno charts on Hordpower.com's website --  
>> www.hordpower.com.
>> JD builds my Ducati race engines, and several of the dyno charts are of 
>> my
>> 900SS/SP.  My bike, with high-comp pistons, 41mm Kehins on stock intakes,
>> and Termi slip-ons made 84 hp, on a notoriously stingy dyno (my 749R/848R
>> racebike usually reads about 2-3 hp higher on the Dynojet dyno at the AMA
>> races than on JD's dyno, which is the same brand an model).  He even
>> admitted that was high for a 900SS, but why argue with success/good luck?
>>
>> A 944 kit will add a bit more power, but you'll never see much more power
>> from a 900SS until you *really* work on the ports in the head, install 
>> big
>> valves, new cams, short intakes and individual carbs.  You're going to
>> spend a bunch of money and the power gained will be at the top of the rpm
>> range. And you'll lose some of the "streetability" that makes the 900SS
>> such a fun bike.  I've heard a lot of claims over the years, but I've yet
>> to see (nor has JD) a 900SS put out more than 100 hp on his dyno.  So
>> you'll be spending a *lot* of money to pick up 10-15 hp in the upper end
>> of the powerband.  To me, unless you're racing, that's not what the
>> Supersport bikes are all about.
>>
>> I don't know a lot about the 2-1 exhausts -- I've never owned one and 
>> I've
>> never really seen any comparative dyno charts for one.  I do know that
>> most of the AHRMA racers run 2-1-2 exhaust, even though many have tried
>> the 2-1 systems.
>>
>> My bike now has a full Termi spaghetti system like yours does.  I haven't
>> dyno'd it since I installed it, but it adds enough ground clearance (and
>> looks so cool) that I'd leave it on even if I lost some hp!  The things
>> are extremely rare and very desirable, so if you do go to a 2-1, you can
>> probably sell your Termi system for enough to finance the custom 2-1 and
>> have money left over.
>>
>>
>> Mark Hatten

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